A book on picking up women is CLEARLY not a Miracle Cure. I don't even see how a bloody-minded and vindictive Google worker could come to that conclusion. I'd love to see him argue it, too.
A book on picking up women should not be classed as adult content. Anyway, even if you're breaking the letter of that rule, you're not breaking the spirit of it. It's there to stop the sale of porn.
It just sounds like Google have fucked up. Good luck contacting them. They're fuckwits.